Ceiling lamp



FIG. 1 is a perspective view of a ceiling lamp showing my new design;

FIG. 2 is a front elevational view thereof on a slightly reduced scale;

FIG. 3 is a top plan view thereof on a slightly reduced scale; and

FIG. 4 is a bottom plan view thereof on a slightly reduced scale. 

The ornamental design for a ceiling lamp, as shown and described. 